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ITER Task T426 – EU SHUT DOWN DOSE RATE EXP. for ITER

ITER Task T426 – EU SHUT DOWN DOSE RATE EXP. for ITER. Objective : verify shut down dose rate calculation for ITER out-vessel, in-cryostat for t cool 1 month. Mock-up irradiated at FNG (3 days) to have a detectable dose rate (ENEA, TUD, FZK).

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ITER Task T426 – EU SHUT DOWN DOSE RATE EXP. for ITER

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  1. ITER Task T426 – EU SHUT DOWN DOSE RATE EXP. for ITER Objective : verify shut down dose rate calculation for ITER out-vessel, in-cryostat for tcool1 month Mock-up irradiated at FNG (3 days) to have a detectable dose rate (ENEA, TUD, FZK) The shut down dose rate outside the ITER vessel is calculated by 2-step method (MCNP/FISPACT) and by 1-step method (MCNP-modified), using and FENDL-2 data, within 15% from a few days up to 2 months of decay time

  2. EU Fusion Technology Program – Nuclear Data Experimental validation of EAF activation cross sections 1.5 C/E 1.0 0.5 0.0 • Beta power • Gamma power Beta power Gamma power C/E EUROFER 1.5 Decay time (hours) Decay time (hours) 1.0 0.5 0.0 1 10 100 1000 • Detecting system developed to measure simultaneously the total activity of a neutron irradiated material and the electron and photon decay heats • Activation/decay heat in EUROFER g- and b-decay heat measured up to tcool~ 20 days,g- activity measured up to several months of cooling time Deficencies in beta decay heat identified in the comparison with EAF predictions • Decay heat in 12 materials (Cu, Ag, Sn, Cd, Mg, Hf, Mo, Al, Ti, Ni, W, Re) g- and b-decay heat measured and compared with EAF predictions Some deficencies identified in EAF • Activation/decay heat in Cr and other materials is in progress (2001 activity) EUROFER long irradiation time

  3. EU Fusion Technology Program – Nuclear Data Validation of EFF cross sections for advanced materials . SiC EXPERIMENT at FNG (2000-2001) (ENEA, TUD,FZK, IJS) Objective Provide validation of EFF data for Silicon carbide which is a candidate low activation material for the fusion reactor, and is considered for development in the European Fusion Technology Program (SiC block on loan from JAERI within IEA collaboration)

  4. EU Fusion Technology Program – Nuclear Data Validation of EFF cross sections – SiC experiment • Measurements (already completed) • neutron and gamma spectra (TUD) • Activation (ENEA) • nuclear heating (ENEA) • Analysis (in progress) • C/E for all measured quantities for EFF (and FENDL-2) libraries • Sensitivity /uncertainty analysis based on 3D MC and 2D deterministic approaches

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